Netflix's Creepy New Serial Killer Show 'Mindhunter' Is Based On A Terrifying True Story

Today, Netflix dropped the first full trailer for its upcoming crime series "Mindhunter." Directed by David Fincher (best known for his work on the "Gone Girl"film and "Zodiac"), the new series is set to explore the horror and drama behind some of the earliest investigations into serial killers.

Starring Johnathon Groff as Holden Ford and Holt McCallany as Bill Tench, the show is based on the real-life work of John E. Douglas and Robert K. Ressler. Douglas and Ressler were FBI agents specifically assigned with the task of investigating what would eventually be known as serial murder.

The show is loosely based on the criminal psychology book of the same title, a groundbreaking work that explored the motives behind some of the country's most gruesome repeat murderers. The book details the beginnings of what become known as psychological profiling, which is a theory used by investigators suggesting parts of a killer's personality can be detected in a crime scene. By deducing specific patterns in these details, detectives can more acurately predict future crimes.

In 1970, Ressler joined the FBI Behavioral Science Unit, where he helped organize interviews with 36 incarcerated killers in the hope of better understanding their motivations. Ressler was also behind the creation of a database of this material, known as Vi-Cap. Throughout his career at the FBI, Ressler worked on some of the most notorious cases in American history, including that of Jeffrey Dahmer, Richard Chase and John Joubert.

Douglas claims that his early research elicited doubt from his colleagues — until they began to see the usefulness of his methodology. Douglas served as the inspiration for the Jack Crawford character in Thomas Harris' legendary horror novels "The Red Dragon"and "The Silence of the Lambs."

Ressler and Douglas willingly explored some of the darkest corners of the human psyche, and their work has been immeasurably helpful in the apprehension of innumerable criminals since.

Netflix clearly has high hopes for the new series: The show has already been renewed for a second season — long before the first episode has even aired.